I think most of the coins that flow through mixers are from petty scammers and signature spammers who are taking precautions to cover up their own shady activity in order for it to continue.
I had used ChipMixer to not reveal to my merchants that the funds come from signature campaigns. It costed zero, and it was fast. I'm pretty sure lots of other clients thought it this way.
What do you think the merchants that receive funds from you marked to be from a mixer and possibly even from criminal activity think? Your beliefs might be cute in your head, but when you're doing things that can get other people's businesses caught up in criminal investigations that doesn't make you a hero for privacy, it makes you an asshole.
Centralized solutions will obviously never solve the privacy problem.
But decentralized solutions will solve the "shady and criminal activity" problem... I'll never understand your perspective.
My perspective is that a privacy solution shouldn't setup someone to be investigated for accepting Bitcoin or land the service provider in jail while having all the service users' funds confiscated. If all transactions are private, then we're all accepting the same consequences and fighting for privacy. Your solution leaves the service provider and the unknowing recipient to take the fall for your privacy. Again, not a hero fighting for privacy, a weasel that leaves others to take the fall for the sake of his privacy. I don't want to support weasels, I want to fight for real privacy.